Complex humanitarian emergency (CHE), type of disaster event that is caused by and results in a complicated set of social, medical, and often political circumstances, usually leading to great human suffering and death and requiring external assistance and aid. CHEs are associated with a variety of factors, such as war, poverty, overpopulation, human-caused environmental destruction and change, and natural disasters. The United Nations (UN) considers a CHE to be a crisis involving multiple causes and requiring a broad and integrated response with long-term political and peacekeeping efforts.

The human-made or natural events that cause complex emergencies introduce hazards into populations that are both vulnerable and susceptible to those particular hazards. The event then exceeds the capacity of the society to respond and therefore demands regional or international assistance. Most often, CHEs result from dramatic events leading to a synergy of hazards, which often include infectious diseases; limited access to food, clean water, and housing; violence; and failing health infrastructure and the absence of immunization. Children between 0 and 5 years of age are at particularly high risk in these situations. Relatively minor acute events in the setting of chronic violence, political unrest, and poor health and educational infrastructure can result in significant elevations in illness and death. The majority of deaths from outbreaks of infectious disease occur in less-developed countries that lack adequate public health practices and health infrastructure.

In industrialized countries, CHEs usually result from massive natural disasters, such as intense hurricanes or earthquakes, or from the effects of advanced weaponry on humans and physical infrastructure (e.g., buildings and roads). These societies usually have high baseline levels of health and education but are overwhelmed by the disaster event. Initially, illness and death result from injuries sustained during the acute event. Later, a state of overcapacity or breakdown of the health infrastructure leads to suffering and death from the complications of untreated chronic diseases, such as diabetes, heart disease, high blood pressure, and undernutrition. Aging populations are especially vulnerable to disruptions in care that occur during this phase. Dealing with psychological trauma is a major component of the recovery phase from these events.

CHEs demand a complex multimodal response. Responding UN agencies, governments, and nongovernmental organizations must work to rapidly assess the needs of the affected population and meet those specific needs. Organizations maintain Web sites and staff to assess needs and coordinate these multifaceted efforts.

In CHEs, infrastructural and logistical coordination are no less important than financial, material, and human resource support. The response must simultaneously address the immediate effects and the underlying causes of the emergency. Many organizations also include development and sustainability in their goals for disaster response.

The resilience of a population to the effects of a complex emergency has many social, cultural, and political determinants. Although a CHE may not be entirely preventable, its impacts may be reduced by resolving underlying insecurity in the determinants of health before an acute event. Mitigation of disease and death can be achieved by a robust emergency infrastructure and detailed emergency planning.

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